| 1 | Plane mirrors, convex lens and concave lens. | |
| 2 | The visual acuity could be corrected to 1.0 with proper negative lenses. | |
| 3 | A rectangular negative lens at the front shrinks the scene to match the picture area; | |
| 4 | Light beams scatter through refraction of concave mirror, and can not form true image, hence we can not measure the focus of concave mirror directly. | |
| 5 | The observation lens is the single-tube visual lens, eyeglass is made of a concave lens, and the inner part of a lens tube is provided with a visual distance increasing device. |
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